San Diego Formation
| San Diego Formation | |
|---|---|
| Stratigraphic range: Pliocene | |
| Type | Geologic formation |
| Lithology | |
| Primary | Conglomerate |
| Other | Sandstone |
| Location | |
| Region | San Diego County, California, Baja California |
| Country | United States, Mexico |
| Type section | |
| Named for | San Diego, California |
The San Diego Formation is a geological formation in southwestern San Diego County, California, United States, and northwestern Baja California, Mexico.